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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2966d74e2148ff0f13d95fa17a4d662ffba30db623ba1fc6ecf3c88f60deaa' 
  AND token = '0DjV0y3BR88ZNMm7TlBgaOmDp+oeINA/ww5PTePKPTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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