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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e9f40f13ad21db09b07b36ad396b7f9e7cc9a30ad9b2f034df61b1c379c0c8' 
  AND token = 'bWyYDrKc2nT2Gqd8bPxtb0Yhe8YmF1MGUxHbiudv1bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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