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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00922c96058a2d7a6ef1bf5c310b532828c2c22cefbfcca05a2a0b9cc6ea58f' 
  AND token = '3B46w2kmnTVvq3goz5GsNB7QKi7SpsTqnLSDCFDYIUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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