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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6b92d3cd2b40c6bbeffbfdaea0f9ed86e32cd223891ca534f138b773fe3460' 
  AND token = '/l1FVrzO5S1y8exFYmmvSA/BfURU9TQHPdrfv+t1Ias=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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