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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c39d1b04da5e223b98a397674a6a44ef26145ba6244c2e41362bf1992482aa' 
  AND token = 'ft75rWe7wLOKtBjcYaIMI5jXg2guwpY3untNZ2PBpCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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