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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3295c409e090cea449f7fc0f504330f5e30f3d1afcf5641bdbfc24941aea8ee4' 
  AND token = 'AVf1qizELhIw58/DFLgDt64tKBLDqUFxCWUVhj66Few=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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