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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f90164aff889f0ea9c0e7489d169f232b5272ec0d9ae744998489b769c23e7d2' 
  AND token = 'dd2y1Uf0d1SaW/sJxAy4ChQ8Uqj0JuLNMB7hmao1Who=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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