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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bbc9f0cf921d1192c8998913f932d831b2ba1c6d1e72c6b62f4bc1a118992a' 
  AND token = '8q3sggtd2Pu9RHCqJ7+QYUpqffhow1cEF1FNhHMMidQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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