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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bbcfc081dda38db2f2db0f79d2e6dc45a96be918357fdcd05d964828e624c8a' 
  AND token = 'Y0OhANLq9Lm/TSeqS29zdtyp4D/GcT+ft2HpCcDcBP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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