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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a30c0e08fcc8e3f95d348f0662e01021f0927036280c88a9709171deb3eced' 
  AND token = '5qlX+mr+HZ1t/o3gBb57U44zWQZmo/rLDdOPErMvQbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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