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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a56c56bf4bef926ffe8233cf4163ee6806df93ea247d8ead352acc498d16e6' 
  AND token = 'b7NEo4go2ifcOY841wMzkLf8d6NQ4N+hJiydzClpnAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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