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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7555607f41681de3455c3b26ea5340187dbc8e5303a04da4b0c7b68073f6353' 
  AND token = 'E2YOI84Xx8mSGyZrqvkqaC3P4EpKhf2ogOdAWOCGnos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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