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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3da3ed598ac562f25d6a3ec47f0cf0360486300a53395516dc1e15a2facbec' 
  AND token = '6JTZ/QDH/7rtK7fbbJAT6gsbVKwW1zrT6bNdPvoM90c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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