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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4919af8f890d2acfca2ad92790ca3e3f2a77a18f5a005dbd321be76c62a06c' 
  AND token = 'ZcduPN5JVSyDHNu1os/e77qfcNy9YiRskaakLlDNunQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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