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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f8fb4bfe1c34526303e5738f385d945901e8810ae982bd031c553af9cb4a18' 
  AND token = 'fFe8xNKU7V+7sufDSZupRJ7fZ2uhow5gsJAIsb5JudM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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