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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c62e66d6804718476aede7f9a9eec58fe5a4a5aefab456fdd68d5a280dcca20' 
  AND token = 'xi7nJdNXCJ+Kn38fTzEHLUZRIQdNc3JDBC1BQqCRg0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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