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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea72be881de3dc48c3f058010a56530285af15f98034e5470d4170f3a98b89f0' 
  AND token = 'TnT6F2xSMJNx+IXWbtznPAYC0OXLnSlyBepXY76o94w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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