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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e075b9f1d9a55e2812d2d4b04bab2d736750c73e88dcb7f5415a7d04578ae0' 
  AND token = 'eSRKGg2JBEtJJo3sadzR5cty+l0wvVh96ONACpDOJCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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