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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f63d83c6cba518f088cf259d70c5634a01d72eef6c4372c2f3b00e2d953a20' 
  AND token = 'fgkAG3tPexcdThFnofjY5Q96jq4NZuPqVzn0rF2tV88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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