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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c2ec284b2942d207e2ca3b5384151d373face6659a399c9fbef1e96696ef5b' 
  AND token = 'f0dn0LtHB8jdBum2QuxDzkJ0BcRtcHsz/5lzVOzADtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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