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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7615803838bdf98fd03fac13131ada3c73bff12552d937881144bc1a083bf49b' 
  AND token = 'dbExYk3+B/SJ/9XDx2eqx/GH4S5Fl1Ayhc45Ftm2Rls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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