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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82b72afe7681fb93df3baf225adbd48de2cc662eb8414aef4c8797f66f231f1' 
  AND token = 'jqqOBCpvy8B3o7+GaxQ0FQ81f/QKSvi4aGXDxTOvLPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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