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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a531fd4aaec8299491b712de7e138c5ff2a26314a10369dde5f590051580f6f' 
  AND token = '32/xIereyvtkeJ5hTR7ZevBFbjvnrRIdaIB2JH1h9/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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