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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96462d240f46b0e965c5a99e2ccc1e14499732a3a5e0f61d445ad53e98c2d41a' 
  AND token = '2plmNOmMta6InAiWikPpLcIJTgI5PdAGd/W8ca+lFLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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