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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f5e117a76ff06b1aa50e1c06f173a11f04bfe31b505a2f656e866864651ba0' 
  AND token = 'IvuakaxKFp1RdoHcff4LH76XMY4QE6axrfNHaQ2lMCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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