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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13835aee2e1b16bde3967aac3145e7740de0e68a6a500c1c464bda39ab688dc6' 
  AND token = 'nMdGsul7PRPbc1M6PHb51Nc6ho/MTq/gg8c2ferinxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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