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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4fe945b862d9d252e13b94f81e8fd1a61f2deb686d1e48c70e27863bcb3a39' 
  AND token = '4jPXA+A2eizyuU7txQe613DmHTXScLtGfyZFiKgssa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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