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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18e0bf4ef3ada0b9f4d7bd107ea39ff7fbd1153193ca6fac611bfd67c3b9986' 
  AND token = '7iq966zExInT1PUMtXKrY2yVRjkI9nkGwvynx8waAXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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