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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b51de631bc376e2ac1faa6eb03c3cb5cbcb665e4cd380b87fe000048c49e2e' 
  AND token = 'FRzQJLtx1NL+hxdxF8j5QmcWdsv7Wu8PrH7KELH3aqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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