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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bad1bbb033042a8fe17a24acb2f0f5d306997810a366114892ef91501ec0291' 
  AND token = 'gnCWJhVmxEyz5vvg96RP8y3eA9clpkKiUzOFjhCv1gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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