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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547c21fc0660e5ce2463d16b6586de8b403a6811d4f42dff470977c5e8fa3cba' 
  AND token = 'ea2aYb/ycG0vOmgXpIVYlJrnuvAqnSi6f6RCZVP7RqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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