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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae6c47534c01c5c1befcfe57a748b0b5bc1415afacad345ebe04bcb4e5d098b' 
  AND token = 'u8tOhrs+rZ+7biuUK5/aDj0EAg8TuX3FtOfPVut38Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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