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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabd57f87c0d7cab2e5835061b48a19ffc30606302169da05a19f59157de99ed' 
  AND token = '0H/g/63K+JBCAyNSrqTJT99Ek2NxbcLtbF1VUowEhHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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