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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7071d2acc764759d703d5d297502214dadf522e2bf868718b9e2a0a7f0ad41f' 
  AND token = 'Hy7f6s5ebexJv3p2HgMeO1D78nEReAP7TJ6R1s9EjTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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