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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d31edc6e3a723d7cbe3fc5a12628116b52229e895bb2ba6aac5ed680cd1b2d4' 
  AND token = 'lTff34DyCvLJIy/xq2INe2q2/oB5cBSneJ0sYgbCGPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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