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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28be98b4956315e6ef7cf1bd27b3c7eb57a19512e459c184e2d9e2e67403af2c' 
  AND token = 'T79Fh31yuE0hlO8mitIN+cdCDRQ/7tpoWZcptebnFVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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