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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68af042d923d794442419075c7d06e17bc0ef742864c167e844adb8651a02c13' 
  AND token = '6beeNwH2YUhE4t/yuOTWbRL65XCUsAebxbR8a1ysl2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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