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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856f77a11882aed958a7737038c3dc7cc6e0ebfdd5b9960a62c1a6891469b09c' 
  AND token = 'V2dK+btIfaN3EdUWyQlO6144wqRiMhdFhz6b0TR/MlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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