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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611007a3194873aefb70d057cd2b0e6b0dcf44b2a9f43891db7dcbd6f0a825d3' 
  AND token = '0+G8d8sf7vNdGPn1j56xc+znrbS296fQcDtYhSmarrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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