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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2612a49f827fc0efbb23e015e0c9875a026a0e506f2ac0a5a817640500b5947' 
  AND token = 'kVS2defaKh6coh9s2QfP4SOkA2qRx6usxe6oKm1rG3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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