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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a38a45fb1d3858546c6b0870f7ac2aba98620cf06938eac5ee46c93b5002535' 
  AND token = 'p5J9CZxiyZeG0JDgULYU/ZrLeKYDdO4sq9+NXJf7t98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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