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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9171cc6ad9deb30d38a3e5ebaf62aaf7862fefba7387ac75620a356992f0089d' 
  AND token = 'tTsnz2ymsUl6JZ6nH6i97+HPu15GXZvUk18AdbvBO4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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