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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c6bc059431c7a06062f50dad7e8d7bf5f13c95c33a38781fa1abb2c70b4e8e' 
  AND token = 'z5UTOp8VYdYLNMf1aQ7VflES2AX8f8YE9lA663ufQ5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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