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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763d6b08d01c31e3a12d8100a3859f9a9458d3ff274fee01bb12de782ca5a3ee' 
  AND token = '2RvnyGXxl/N37BdEFu3J7cnQp6CUpgH4tJghRkV0HSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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