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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22a6f9f26b9137ea6686507eef072f8075365b0c6ce5bff1b99b7e6fb0289c25' 
  AND token = 'V1sNDFEdz46OqVK7CgojQLhQ1rFFBWbTdofPeWMIWzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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