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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79b635746a1ea01dcad4144400c8b9eebda2cf02f5b7dc548d667445d5f610b' 
  AND token = 'vAvNxSGj6U8AbpurB5ZvP1jI7SI5NIgo3cj8yC1g49A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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