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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5203024e35d41ef8d81b9a2ed0520c8b03b6508b7fb519bd93d9fbee5d1943ae' 
  AND token = 'Nc9ICprFvD34a7vyOanPf4p7fAII3Aw9/sShajKCdSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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