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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57771365af40cfa03801df45185dbd59956d7dd1e2a106010c7d3c3871f01f5' 
  AND token = '9s0Sh/7V7nJRiECN++aMWLniEI8r6EdANNOwVhZr0tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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