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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3a9a12ea4ea6692b87dd7f8cc77d5ae826d47bfd797cfa6a9f81150205b559' 
  AND token = 'RhDqHCBS4MR1SzaaXl/4PsDqlLbpJWgosaOjFcy+cbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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