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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b814c98353142017735ba18e99bad77fe6c3f262bc7b719ff6d00d710c74f800' 
  AND token = 'bAz1z36ENwVRZyQaplgdROTEuOOUlPU3PNC1sT40zYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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