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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba1d7747e58e9b6e14c213f6c323e0d57a6bc387709a70ad3a8aa040d72952f' 
  AND token = 'VbCufXcRZEX0Ck5ULWPGxDbRv0crG3INJyvNQC4j0j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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