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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f913e4673a6f7ad840d956fb3183c14ad2457f1f4b667abb661f77a630b0a1' 
  AND token = 'nl8/8x1wX1p0m7oW5UIX95wKioD+gw1IkJQTbPb5jj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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