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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0be4a10f3c677ac29ddc20a414c6b1ae52610d55dbdf5dacaae432869e8f42' 
  AND token = 'zaVp/dWlQdCPXmNRdw6KW0WbtbOp9DnfnLX3n29C/cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}