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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b32897fb718fde7ed6cd087b9954b20a9cc5fd105ee7367b84e1657257efaa' 
  AND token = 'mkS6d7H5sWSMELm1vyQOL4UtrSmEnsH26R0DE+FxyH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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