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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8438d91031a2552780b9830f92033285e080254ff3f8dd34e95e952ac2cb723e' 
  AND token = 'u2+Ngk9sRDNQwPzbDPBcZK/hx4xg6cO4Q8W7Uns1QJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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