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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0aab2fb59d5e238805e41a5af35ece7268b23872c6b0854eb0b8e5b91ae51aa' 
  AND token = 'Hy8wucBiJ2mOLhMPDs3iU8EisP+/Rez2gNcItIVcXPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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